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The Increase of Rain in the Antarctic Peninsula Redefines Climatic Patterns, Accelerates Melting and Expands Environmental, Historical and Operational Impacts on the Frozen Continent
A significant scientific climate transformation is already underway in Antarctica, especially in the Antarctic Peninsula, the northernmost part of the continent.
Historically rare, rain in the region has become more frequent, according to field records collected by researchers over the past decade.
Traditionally, the dry environment preserved historical cabins, runways, and scientific structures, as the absence of liquid precipitation limited degradation processes.
However, the advance of regional warming has altered this balance and begun to change the precipitation dynamics.
The Antarctic Peninsula is warming faster than the global average and, therefore, has become an early indicator of what may occur in other coastal areas of the continent.
Climate Review Points to Progressive Increase in Rain on the Peninsula
Recent studies analyzing high, medium, and low greenhouse gas emission scenarios indicate that total precipitation is likely to grow slightly throughout this century.
However, an increasing portion of this precipitation will occur as rain rather than snow.
Additionally, days with temperatures above 0 °C are becoming more frequent, favoring the change in the local climate regime.
This behavior has already manifested in recent episodes of extreme heat.
In February 2020, for example, the temperature reached 18.6 °C in the northern part of the peninsula, while a nearby ice shelf recorded record surface melting.
Moreover, atmospheric rivers, corridors of warm and moist air from lower latitudes have begun to influence the regional climate.
In February 2022, one of these systems caused historic surface melting.
Later, in July 2023, another event brought rain and temperatures of +2.7 °C during the height of winter in the Southern Hemisphere.
These records demonstrate that the occurrence of rain is no longer isolated.
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Accelerated Melting and Structural Risk of the Ice Shelves
Rain acts directly on snow and ice.
First, it accelerates surface melting.
Then, the resulting water can reach the base of glaciers and lubricate the glacial bed.
Consequently, the sliding of glaciers may intensify.
Additionally, on floating platforms, rain compacts the surface snow and promotes the formation of ponds.
These ponds absorb more solar radiation and, therefore, heat up quickly.
As a result, the water can penetrate the ice structure and weaken it.
Similar processes have been associated with the collapse of the Larsen A and Larsen B ice shelves in the early 2000s.
Sea ice also becomes more vulnerable.
The reduction in reflectivity accelerates melting.
Moreover, the loss of this layer reduces natural protection against ocean waves.
Ecosystems Under Increasing Pressure
Climate change also alters the ecological balance.
Rain can flood penguin nests and endanger chicks, whose feathers are not waterproof.
Additionally, warming oceans and the reduction of sea ice affect krill, the food base for various species.
Ice-dependent species, such as Adélie and chinstrap penguins, face greater vulnerability.
Meanwhile, more adaptable gentoo penguins are expanding southwards.
At the same time, the removal of snow cover alters microscopic communities, such as snow algae.
These algae influence solar absorption and participate in the terrestrial ecosystem.
Furthermore, warmer seas may facilitate the arrival of invasive marine species.
Scientific Infrastructure and Historical Heritage on Alert
Research bases were designed for stable snow, not for continuous liquid precipitation.
Rain can freeze on runways and disrupt operations.
Additionally, melting compromises structures and equipment.
On Alexander Island, increased surface melting has already made access to areas studied since the late 1990s, such as Mars Oasis, more difficult.
At the same time, 92 recognized historical sites and monuments in the Antarctic face structural risks.
The melting of permafrost compromises foundations and accelerates the deterioration of wood.
The Future Scenario of the Frozen Continent
Projections indicate that if global warming reaches 2 °C or 3 °C this century, extreme events, rains, and surface melting may intensify.
The impacts on ecosystems, glaciers, infrastructure, and historical heritage could become severe and potentially irreversible.
Limiting warming to less than 1.5 °C will not completely eliminate changes, but it may slow their progression.
In light of this gradual transformation, rain ceases to be an exception and becomes a new agent of climatic reorganization in Antarctica. In this context, what will be the next limits of this change process on the frozen continent?
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